Tension device for spools



(No Model.)

'J. W. WEST. I

TENSION DEVICE FOR SPOOLS.

Patented Feb. 22, 1887.

Invenia'r 6M WM tw/f vG I UNITED STATES PATENT OFFICE.

JOHN W. WEST, OF BRAINTREE, MASSACHUSETTS.

TENSIONTDEVICE FOR SPOOLS.

SPECIFICATION forming part of Lette rs Patent no. 358,313, datedFebruary 22,1867.

Application filed May 10I 1886. Serial No. 201,773. (No model.)

To all whom it may concern.-

Be it known that I, JOHN W. WEST, of Braintree, in the county of Norfolkand State of Massachusetts, have invented a-new and useful Attachmentfor Spools, of which the following is a specification.

This is a device adapted to be attached to spools of thread, especiallywhen placed upon sewing-machines, the object of which is to regulate thetension of the unwinding thread.

In the accompanying drawings, in which similar letters of. referenceindicate like parts, Figure 1 is a view of a spool with my deviceapplied thereto. Fig. 2 is an enlarged'vertical section of part of aspool with my attachment in position thereon. Fig. 3 is a similarsection of the device removed.

' A is an ordinary spool, in Fig. 1 represented as placed on a stand forfeeding a sewing-machine.

My device consists of a round metallic piece or plug, B, extending downinto the hole in the spool, chambered at B, and provided with an annularflange, B, to prevent the device from dropping into the spool.

In the upper end of the chamber B is a block, 0, from which the bentwire D extends, passing through the upper portion of the device, asshown. This wire is provided with the coil D for thethread to passthrough, and as the thread'unwinds the wire revolves around the spoolwith it. E is a screw, resting in the lower end of the chamber B, whichis threaded at that point for the purpose.

Between the screw E and the block 0 is a 35 spiral spring, H.

It is evident that the pressure of the spring against the block 0 isgreater or less as the, screwE is higher or lower. Hence to increase thetension by causing the block 0, which sup- 0 ports the wire, to turnharder, the screw E is raised, and vice versa.

Of course the block 0 and wire D are free to revolve, and theweight ofthe device, which is preferably of metal, issufficient to keep it 5motionless in position.

Devices of different sizes are provided for different-sized spools.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

The herein-described device for regulating the tension of thread as itunwinds from the spool, consisting, essentially, of the piece or plug B,provided With the chamber B and flange B, the block 0, free in the upperend of said chamber and provided with the wire D, which extends upwardtherefrom, the screw E, and spring H, between said screw and said block,substantially as and for the purpose 60 set forth.

JOHN W. WEST.

Witnesses:

HENRY W. WILLIAMS, J. M. HARTNETT.

